To explore the effect of heating and ventilating scenarios on indoor and outdoor PM2.5 mass concentrations and correlations, particulate matter mass samples of different size distributions were collected in three different residential houses(H1 with ceiling radiation heating+24 h filtered fresh air supply system; H2 with household floor heating system; H3 without heating)in Nanjing in the winter of 2014 to 2015. Meanwhile, hourly indoor and outdoor PM2.5 mass concentrations were also monitored. Experimental results indicate that PM2.5 is the dominant pollutant for both indoor and outdoor air. The ratio of PM2.5 and PM10 is higher than 74% for both indoor and outdoor air. The correlation coefficients of PM2.5 mass concentrations between the indoor and the outdoor in the tested houses are 0.840, 0.825, and 0.923, respectively. The indoor PM2.5 mass concentrations in H1 are the lowest, and only 22.1% of outdoor PM2.5. Particulate matters in H1 is smaller than 2.5 μm. The indoor PM2.5 mass concentrations in H3 are the highest, and the correlation coefficient between indoor and outdoor PM2.5 in H3 is the highest as well. Particulate matters larger than 2.5 μm are found in H3. Residents in hot summer and cold winter zone are recommended to change their traditional ventilation mode(opening windows)to the organized and filtered fresh air supply system, thus it will help to prevent the ambient haze pollution on indoor air and improve the indoor air quality.